std::fpclassify

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Defined in header `<cmath>`

int fpclassify( float arg );		(C++0x feature)

int fpclassify( double arg );		(C++0x feature)

int fpclassify( long double arg );		(C++0x feature)

Categorizes floating point value arg into the following categories: zero, subnormal, normal, infinite, NAN, or implementation-defined category.

arg - floating point value

one of FP_INFINITE, FP_NAN, FP_NORMAL, FP_SUBNORMAL, FP_ZERO or implementation-defined type, specifying the category of arg.